<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>

</head>
<body>
<!-- view -->
<div id="app">
    <select v-model="message">
        <option value="">--请选择--</option>
        <option>A</option>
        <option>B</option>
        <option>C</option>
    </select>
    <p>选中谁：{{message}}</p>
</div>
<script src="https://cdn.jsdelivr.net/npm/vue@2.5.21/dist/vue.min.js"></script>
<script>
    <!--model-->
    var vm = new Vue({
        el: "#app",
        data: {
            message: ''
        }
    });
</script>
</body>
</html>